Problems with "Rewrite URL structure" in Minify Settings

When I enable ‘Rewrite URL structure’, it looks like minified files are not being created. I get an 404 error for the .js and .css files in the Browser.

I use Nginx Webserver, and the W3tc rules are included in my ‘server’ directive. I just can’t figure out where the Problem is.

My WordPress Nginx File:

### Nginx configuration for WordPress.

server {
## This is to avoid the spurious if for sub-domain name
## rewriting. See https://wiki.nginx.org/Pitfalls#Server_Name.
listen 8080;
server_name https://www.mydomain.tld;
rewrite ^ $scheme://mydomain.tld$request_uri? permanent;
} # server domain rewrite.

server {
listen 8080;
limit_conn arbeit 10;
server_name mydomain.tld;

## Parameterization using hostname of access and log filenames.
access_log /var/log/nginx/wordpress_access.log;
error_log /var/log/nginx/wordpress_error.log;

## Root and index files.
root /home/username/www/wordpress;
index index.php index.html;

## See the blacklist.conf file at the parent dir: /etc/nginx.
## Deny access based on the User-Agent header.
#if ($bad_bot) {
# return 444;
#}
## Deny access based on the Referer header.
#if ($bad_referer) {
# return 444;
#}

## Cache control. Useful for WP super cache.
#add_header Cache-Control “store, must-revalidate, post-check=0, pre-check=0”;

## If no favicon exists return a 204 (no content error).
location = /favicon.ico {
try_files $uri =204;
log_not_found off;
access_log off;
}

## Don’t log robots.txt requests.
location = /robots.txt {
allow all;
log_not_found off;
access_log off;
}

## Protect the readme.html file to not reveal the installed
## version.
location = /readme.html {
auth_basic “Restricted Access”; # auth realm
auth_basic_user_file .htpasswd-users; # htpasswd file
}

## Try the requested URI as files before handling it to PHP.
location / {

## Include the WP supercache config.
#include sites-available/wp_supercache.conf;
## Include W3 Total Cache config
include /home/username/www/wordpress/nginx.conf;

## Configure access to WP uploads
location ^~ /files/ {
rewrite /files/(.+) /wp-includes/ms-files.php?file=$1 last;
}

## Clean URLs?
if (!-e $request_filename) {
rewrite ^(.+)$ /index.php?q=$1 last;
}

## Use PATH_INFO for translating the requests to the
## FastCGI. This config follows Igor’s suggestion here:
## https://forum.nginx.org/read.php?2,124378,124582.
## This is preferable to using:
## fastcgi_split_path_info ^(.+\.php)(.*)$
## It saves one regex in the location. Hence it’s faster.

## Anything that has an install in its name is restricted.
location ~ ^(?<script>.+install\.php)(?<path_info>.*)$ {
auth_basic “Restricted Access”; # auth realm
auth_basic_user_file .htpasswd-users; # htpasswd file
include fastcgi.conf;
## The fastcgi_params must be redefined from the ones
## given in fastcgi.conf. No longer standard names
## but arbitrary: named patterns in regex.
#fastcgi_param SCRIPT_FILENAME $document_root$script;
fastcgi_param SCRIPT_FILENAME /home/toralv/www/wordpress$script;
fastcgi_param SCRIPT_NAME $script;
fastcgi_param PATH_INFO $path_info;
## Passing the request upstream to the FastCGI
## listener.
fastcgi_pass phpcgi;
}

## Regular PHP processing.
location ~ ^(?<script>.+\.php)(?<path_info>.*)$ {
include fastcgi.conf;
## The fastcgi_params must be redefined from the ones
## given in fastcgi.conf. No longer standard names
## but arbitrary: named patterns in regex.
fastcgi_param SCRIPT_FILENAME $document_root$script;
#fastcgi_param SCRIPT_FILENAME /home/username/www/wordpress$fastcgi_script_name;
fastcgi_param SCRIPT_NAME $script;
fastcgi_param PATH_INFO $path_info;
## Passing the request upstream to the FastCGI
## listener.
fastcgi_pass phpcgi;
}

## All files/directories that are protected and unaccessible from
## the web.
location ~* ^.*(\.(?:git|svn|htaccess|txt|po[t]*))$ {
return 404;
}

## Static files are served directly.
location ~* \.(?:js|css|png|jpg|jpeg|gif|ico)$ {
expires max;
log_not_found off;
## No need to bleed constant updates. Send the all shebang in one
## fell swoop.
tcp_nodelay off;
}

## Keep a tab on the ‘big’ static files.
location ~* ^.+\.(?:m4a|mp[34]|mov|ogg|flv|pdf|ppt[x]*)$ {
expires 30d;
## No need to bleed constant updates. Send the all shebang in one
## fell swoop.
tcp_nodelay off;
}
} # / location

## The ‘final’ attempt to serve the request.
location @nocache {
try_files $uri $uri/ /index.php?q=$uri&$args;
}

## Including the php-fpm status and ping pages config.
## Uncomment to enable if you’re running php-fpm.
include php_fpm_status.conf;

# # The 404 is signaled through a static page.
# error_page 404 /404.html;

# ## All server error pages go to 50x.html at the document root.
# error_page 500 502 503 504 /50x.html;
# location = /50x.html {
# root /var/www/nginx-default;
# }
} # server

Can someone point me in the right direction?